<template>
	<div>
    <router-link tag="div" to="/" class="header-abs" v-show="showAbs">
      <div class="iconfont header-abs-back">&#xe64e;</div>
    </router-link>
    <div class="header-fixed" v-show="!showAbs" :style="opacityStyle">
      <router-link to="/">
        <div class="iconfont header-fixed-back">&#xe64e;</div>
      </router-link>
      景点详情
    </div>
	</div>
</template>

<script>
export default {
  name:'DetailHeader',
  data () {
    return {
      showAbs:true,
      opacityStyle:{
        opacity:0
      }
    }
  },
  methods:{
    handleScroll () {
      const top =document.documentElement.scrollTop
      if(top>10){
        let opacity = top / 140
        opacity = opacity > 1 ? 1:opacity
        this.opacityStyle = {
          opacity:opacity
        }
        this.showAbs=false
      }else{
        this.showAbs=true
      }
    }
  },
  activated () {
    window.addEventListener('scroll',this.handleScroll)
  },
  deactivated () {
    window.removeEventListener('scroll',this.handleScroll)
  }
}
</script>
<style lang="stylus" scoped>
@import '~styles/veribles.styl'
.header-abs
  position:absolute
  left:.2rem
  top:.2rem
  width:.6rem
  height:.6rem
  line-height:.6rem
  border-radius:.4rem
  text-align:center
  background:rgba(0,0,0,.8)
  .header-abs-back
    color:#fff
    font-size:.4rem
.header-fixed
  position:fixed
  top:0
  left:0
  right:0
  height:$headerHeight
  line-height:$headerHeight
  background:$bgColor
  text-align:center
  color:#ffffff
  font-size:.32rem
  z-index:2
  .header-fixed-back
    position:absolute
    top:0
    left:0
    width:.64rem
    text-align:center
    font-size:.4rem
    color:#ffffff
</style>